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Thank you for posting your question here on Fixya.com. Go to a local home center, hardware or pump store (landscape or pond supplies) and get a self-priming pump that is rated for the delivery you need and the system head that will be present in your installation. Add a semi-rigid flexible suction line with a foot valve and protective screen at the end and a manifold to the discharge that includes a spigot to hook a hose to and you're all set. It will probably run a few hundred dollars if electric driven. If you need a gas driven unit it will be a bit more. If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved! John
make sure your wireing is up to the job and your back presure at the pump discharge is within limits. both of these should be in your pump book that comes with your pump. If you don't have one you should be able to look it up on-line or order one from Pentair.
This could be many things, first Check your lid "O" ring if it is cracked or streched it will need to be replaced. If it is dirty clean it and the pump lid and pot rim with some soapy water and an old tooth brush. Although everyone is told to lube their "O" ring on the pump on a regular basis, but no one tells them to lube it then wipe it down. You don't want excess lube on it just enough to keep the rubber soft and a little slick. Other wise it will collect dirt and won't seal. Of course if you haven't been lubeing the "O" ring that could be the problem also. Other than that the problem will be a bad seal or the pump needs to be replumbed.
Usually, if a pump will not hold its prime, there is an air leak somewhere in the system. Things to look for are small leaks around the equipment-could be a bad o-ring. If you do not see any leaks, turn off the pump, remove the lid from the basket, check it for a hairline crack and check the o-ring under the lid to see if it is the cause of the loss of pressure.
remove the 3 screws on the front with 1/4 inch nut driver remove the diffuser and mounting plate remove cap covering the bolt head on the back of the motor hold the motor shaft with an ajustable wrench or vicegrips turn the impeller counter clockwise it should only be hand tight unscrew the impeller